[vtkusers] How to set enviroment variable VTK_DATA_ROOT

[Denny]

I run the finance example and it give me an error
message:"Please set enviroment variable
VTK_DATA_ROOT".
Then I add a system variable named VTK_DATA_ROOT with
value "c:/program files/vtk40/vtkData" but it seemed
not work. How can I set this variable? 

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